Nanotrasen Block Game is here (#2131)

* tetris!

* softdropping & left,right key holding

* started work on the ui

* playable state

* there you go exp

* multiuser rework

* ui update refactor

* blockgame™️

* highscores, keybindings, ui refactor

* speed adjusts
leveling

* highscorebackground tweak
speed tweak

* NULLABLE

* yes

Content.Shared/Arcade/BlockGameBlock.cs

@@ -0,0 +1,53 @@
+using System;
+using Robust.Shared.Maths;
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.Arcade
+{
+    [Serializable, NetSerializable]
+    public struct BlockGameBlock
+    {
+        public Vector2i Position;
+        public readonly BlockGameBlockColor GameBlockColor;
+
+        public BlockGameBlock(Vector2i position, BlockGameBlockColor gameBlockColor)
+        {
+            Position = position;
+            GameBlockColor = gameBlockColor;
+        }
+
+        [Serializable, NetSerializable]
+        public enum BlockGameBlockColor
+        {
+            Red,
+            Orange,
+            Yellow,
+            Green,
+            Blue,
+            LightBlue,
+            Purple
+        }
+    }
+
+    public static class BlockGameVector2Extensions{
+        public static BlockGameBlock ToBlockGameBlock(this Vector2i vector2, BlockGameBlock.BlockGameBlockColor gameBlockColor)
+        {
+            return new BlockGameBlock(vector2, gameBlockColor);
+        }
+
+        public static Vector2i AddToX(this Vector2i vector2, int amount)
+        {
+            return new Vector2i(vector2.X + amount, vector2.Y);
+        }
+        public static Vector2i AddToY(this Vector2i vector2, int amount)
+        {
+            return new Vector2i(vector2.X, vector2.Y + amount);
+        }
+
+        public static Vector2i Rotate90DegreesAsOffset(this Vector2i vector)
+        {
+            return new Vector2i(-vector.Y, vector.X);
+        }
+
+    }
+}